A “new” translation of Sheela Na Gig

I stumbled across a new (to me anyway) interpretation of the Sheela Na Gig name when looking for images of the Kirkwall sheela. On page 978 of the Celtic Encyclopedia vol 4 by Harry Mountain it lists among other more familiar translations The Idle Hole (Chilo na Gi) not quite sure what language that is in though. It seems to explain the line “Put money in your idle hole” in the song Sheela Na Gig though…